Duplex dumping and shaking grate.



PATBNTED MAR. 5, 1907.

P; L. SHAW. DUPLEX DUMPING AND SHAKING GRATB.

APPLIGATION FILED FEB. 23, 1905.

PEARL LEGRANI SHAW, OF DETROIT, MICHIGAN.

DUPLEX DUlVlPlNG AND SHAKING GRATE.

Specification of Letters Patent.

ratented March 5, 1907.

Application filed February 23, 1905. Serial No. 246.881-

T0 all whom, it may concern.-

Be it known that I, PEARL LEGRANT SHAW, a citizen of the United States, residing at De troit, in the county of Wayne, State of Michigan, have invented certain new and useful Improvements in Duplex Dumping and Shaking Grates; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters and figures of reference marked thereon, which form a part of this specification.

This invention relates to a duplex dumping and shaking grate for fire pots, and conslsts in the construction and arrangement of parts hereinafter fully set forth, and pointed out particularly in the claims.

The object of the invention is to provide simple and efficient means for imparting a longitudinal reciprocation to the grate-bars, as well as an. oscillatory or dumping motion, whereby the ashes may be loosened and discharged from the coal to accelerate the draft without resorting to the dumping operation and the consequent discharge into the ashpan of unconsumed coal.

The above object is attained by the construction illustrated in the accompanying drawing, in which Figure 1 is a plan view of a fire-box, showing the grate-bars therein and illustrating the application of my improved shaking means, the clamp-blocks being omitted. Fig. 2 is an end elevation of a fire-box, showing the ends of the rotary and oscillatory shafts. Fig. 3 is a transverse section through the firepot and end of one of the grate-bars as on line 3 3 of Fig. I. Fig. 4 is an end elevation of the iirt-pot, showing the meshing segmental gears connecting the shafts of the grates.

Referring to the characters of reference, 1 designates the fire-pot, which may be of any desired shape and across which extend the longitudinal grate-bars 2 and 3, which form a support for the fuel, as is well understood in the art.

The grate-bars are provided with the supporting-shafts 4 and 5, respectively, wh ch are suitably journaled and supported to slide longitudinally in the ends of the fire-box and which are retained in place and rendered removable by means of the clamp-blocks 6 fitting the openings in the ends of the fire-box in which the shafts lie, said blocks being also removable by means of the bolts 7 to afford access to said shafts. Upon one end of each of the shafts i and 5 is a segmental gear 8. Said gears mesh and couple the shafts of the grate-bars in a manner to cause them to oscillate in unison when rocked for the purpose of dumping. The faces of said. gears are wide, so as to allow them to remain in mesh when the grate-bars are reciprocated longitudinally in. opposite directions.

Formed upon the inner face of the end of each of the shafts 4 and 5 opposite to that carrying the gear-wheel are the opposed lugs 9, between which the opposed edges of the circular disk 1.0 lie. Said disk is mounted obliquely upon a central shaft 11, journaled at its inner end in the end of the iire-pot and at its outer end supported to rotate in a bracket 12, attached to the end of said pot. The free end of shaft 1.1 is made angular, as shown at 13, for the application of a crank through the medium of which said shaft may be rotated. Upon the rotation of the shaft 11 the oblique disk 10 thereon,'engaging the lugs on the shafts 4' and 5, will impart a rectilinear reciprocation to the gratebars in opposite directions, thereby shaking the grates in a manner to discharge the loose ashes from the fuel in the iirepot. A rapid rotation of the shaft 11 will cause a corresponding reciprocation of the grate-bars, producing a shaking motion that is best calculated to free the fuel from ashes without discharging into the ash-pan the fuel which has not been consumed. When it is desired to dump the grate-bars prior to kindling a fire or to free them from accumulated clinkers, said bars may be dumped by turning them upon their supporting-shafts through the medium of the shaft 4, to the angular end 14 of which a wrench may be applied. By rocking said shaft 4 inwardly the grate 3 is oscillated and likewise grate 2 through the medium of the meshing pinions 8, causing the inner edges of said grates to swing downwardly and their outer edges to rise, thereby forming an opening between them, as clearly shown by dotted lines in Fig. 3, through which may be discharged the entire contents of the fire-box, if desired. For the purpose of preventing the fuel from wedging behind the grate-bars when they are oscillated in the operation of dumping their outer edges are provided with the downwardly-curved fingers 15, which support the fuel when the grate-bars are turned to dump the ashes and clinkers therefrom.

It will be noted that the rectilinear reciprocatory movement imparted to the gratebars is not suflicient to throw the gear-wheels out of mesh and that said bars may be dumped without regard to the position of the disk 10, through the medium of which said bars are reciprocated. It will also be noted that although the lugs 9 are caused to swing away from engagement with the disk 10 during the operation of dumping said lugs return, so as to embrace the margins of said disk when said bars are returned to their normal position.

Projecting from one end of the fire-box is a stop-lug 16, which arrests the grate-bars in a horizontal position and prevents their inner edges from swinging upwardly past a proper horizontal plane. The length of said lug 16 is such as to cause it to remain 1n engagement with the grate-bars during the shaking operation. The presence of said lug also prevents the grates being operated in dumping except in the proper direction.

Having thus fully set forth my invention, what I claim as new, and. desire to secure by Letters Patent, is

l. Grate-bars having end shafts upon which they are mounted to oscillate and to reciprocate longitudinally, means connecting said shafts to cause said bars to oscillate in unison, and means engaging the opposite ends of the shafts of said bars to impart to the bars a reciprocatory movement.

2. Grate-bars having shafts upon which they are journaled to oscillate and to reciprocate longitudinally, gears connecting said bars to cause them to oscillate in unison, and

means independent of said gears for imparting a rectilinear reciprocation to said bars in opposite directions.

3. The combination with a fire-pot, of the grate-bars mounted on shafts journaled therein to oscillate and to reciprocate, means connecting the shafts of said bars at one end to cause them to oscillate in unison, a short shaft supported between the ends only of the shafts of said bars, carrying a disk obliquely mounted thereon, there being upon the shafts of said bars projections between which the opposed edges of said disk lie,whereby rotation'of said centrally-disposed shaft will cause said bars to reciprocate.

4. The combination with a fire-pot, of the grate-bars having shafts at their ends which project through the end walls of the fire-box and upon which the bars are journaled to oscillate and to reciprocate longitudinally, meshing gears upon the shafts of said bars at one end exterior to the fire-pot, whereby said bars are coupled to oscillate in unison, a shaft supported between the shafts of the bars at the opposite end of the fire-box and exterior thereto, an oblique disk upon said centrally-disposed shaft, the shafts of the grate-bars having projecting lugs thereon between which said disk engages, whereby the rotation of said centrally-disposed shaft will cause the grate-bars to reciprocate.

In testimony whereof I sign this specification in the presence of two witnesses.

PEARL LEGRANT SHAW.

Witnesses:

E. S. WHEELER, A. G. I-IowLETT. 

